Lens drive device, camera module, and camera mount device

Abstract

A lens drive device is provided with a shake-correction drive unit for correcting shake by sliding, in relation to a shake-correction fixed part including a shake correction coil part, a shake-correction movable part including a magnet part and a magnet holder, within a plane intersecting with an optical axis direction, using the drive force of a voice coil motor composed of the magnet part, which is held by the magnet holder, and the shake-correction coil part. The shake-correction movable part has a yoke that engages with the magnet holder, and is disposed on the surface side of the magnet part in a direction intersecting with the optical axis direction, the surface of the yoke on the shake-correction coil part side being flush with the surface of the magnet part on the shake-correction coil side.

1 . A lens driving device comprising a shake-correcting driving part, wherein:
 the shake-correcting driving part includes
 a magnet part that is disposed at a periphery of a lens part, 
 a magnet holder that holds the magnet part, and 
 a shake-correcting coil part that is disposed in such a manner that the shake-correcting coil part is separated from the magnet part in a light axis direction; 
   the shake-correcting driving part performs shake correction by swaying, in a plane orthogonal to the light axis direction, a shake correction movable part including the magnet part and the magnet holder with respect to a shake correction fixing part including the shake-correcting coil part by using a driving force of a voice coil motor including the magnet part and the shake-correcting coil part;   the shake correction movable part includes a yoke, the yoke being configured to be engaged with the magnet holder and disposed on a side of one surface of the magnet part, the one surface being one of surfaces of the magnet part spacing away from each other in a direction orthogonal to the light axis direction; and   a surface of the yoke on the shake-correcting coil part side is flush with a surface of the magnet part on the shake-correcting coil part side.   
     
     
         2 . The lens driving device according to  claim 1 , wherein:
 the shake correction movable part further includes an auto-focusing driving part, the auto-focusing driving part including an auto-focusing coil part that is disposed at a periphery of the lens part; and   the auto-focusing driving part performs automatic focusing by moving, in the light axis direction, an auto focus movable part including the auto-focusing coil part with respect to an auto focus fixing part including the magnet part by using a driving force of a voice coil motor including the auto-focusing coil part and the magnet part.   
     
     
         3 . The lens driving device according to  claim 1 , wherein:
 the yoke includes an engaging portion, the engaging portion being configured to be engaged with an engagement portion formed in the magnet holder, and disposed on the side of the one surface of the magnet part, the one surface being one of surfaces of the magnet part spacing away from esch other in the direction orthogonal to the light axis direction; and   when the engaging portion and the engagement portion are engaged with each other, the yoke is positioned with respect to the magnet part.   
     
     
         4 . The lens driving device according to  claim 3 , wherein:
 the yoke has a rectangular plate shape that is attached to the magnet part;   the engaging portion includes a recess that is formed by cutting out a center portion of an upper part of the yoke; and   the engagement portion includes a protrusion that is engaged with the recess.   
     
     
         5 . The lens driving device according to  claim 3 , wherein the engaging portion and the engagement portion are provided with a claw part and a claw fitting part, the claw part and the claw fitting part being configured to fit each other to restrict a relative movement of the magnet holder and the yoke in the light axis direction. 
     
     
         6 . The lens driving device according to  claim 1 , wherein:
 the magnet holder is formed with a resin material;   the yoke is formed with a steel sheet that is a magnetic substance; and   the yoke is formed by insert-molding in the magnet holder.   
     
     
         7 . A camera module comprising:
 the lens driving device according to  claim 1 ;   a lens part that is mounted to the auto focus movable part; and   an image pickup part that captures a subject image imaged by the lens part.   
     
     
         8 . A camera mounting apparatus that is an information apparatus or a transport apparatus, the camera mounting apparatus comprising the camera module according to  claim 7 .